Antivirus software is must-have protection. This review picks the best antivirus software based on its virus detection abilities, features, and breadth of protection. Whether you're seeking total system coverage or an ala carte solution, each of the following products provides superb virus protection for Windows-based PCs. Because every system is unique, evaluate several of Windows XP and Windows Vista antivirus scanners to find the software best suited for your PC and your level of experience.